A member of the terrorist group ISIS who was killed while fighting in Syria over the weekend was born in Chicago, NBC 5 has learned.

Douglas McAuthur McCain, 33, was involved in a battle between two Syrian opposition groups, according to the Free Syrian Army.

Photos of McCain's passport and of his body -- which feature a distinctive neck tattoo -- have been seen by NBC News. According to an activist linked to the Free Syrian Army who also saw the body and travel document, McCain was among three foreign jihadis fighting with ISIS who died during the battle.

Family members and friends in Chicago told NBC 5 that they had no idea McCain had joined the ranks of ISIS and gone to Syria to fight.

McCain moved to Minneapolis with his family for high school and had most recently been living in San Diego, California.

His family said he loved music and wanted to be a rapper, and several years ago changed his name and converted from Christianity to Islam.